Overview of Crash Recovery in Kdump

Kdump is a vital feature in Oracle Linux that helps to preserve the system in the event of a system failure. Kdump, when enabled, permanently reserves part of the system memory to capture and save kernel crash dump information for later analysis. Additionally, in the case of a kernel crash, kdump safeguards the system by automatically booting in to a clean and reliable second Linux kernel, called the captured kernel, which also resides as part of the reserved system memory.

Note:

The Kdump service is initially enabled at the time of installation. In the event that the Kdump package or the service wasn't configured at installation, administrators can install the package and enable the service from the command line. For more information about installing and enabling the Kdump service, see Installing Kdump in Oracle Linux 8: Monitoring and Tuning the System or Oracle Linux 9: Monitoring and Tuning the System.

When Kdump is properly configured on the host system, Cockpit administrators can use the Kdump application in the web console to view and manage Kdump configuration properties and test the Kdump configuration as needed.

Important:

The Kdump reserved memory usage property is configurable only from the command line. For details about the setting the reserved memory usage property from the command line, see Working with Kernel Dumps in Oracle Linux 8: Monitoring and Tuning the System or Oracle Linux 9: Monitoring and Tuning the System.